1.

    Which of the following alkynes upon reaction with HgSO4HgSO_4 and H2SO4H_2SO_4 yields a product that exhibits keto-enol tautomerism?

    A

    2-butyne

    B

    1-butyne

    C

    3-hexyne

    D

    2,2-dimethyl-3-hexyne

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Alkynes, Hydration, Markovnikov's Rule, Keto-enol Tautomerism

    Related Questions

    1.

    The treatment of calcium carbides with water gives

    A

    ethene

    B

    acetylene

    C

    ethane

    D

    propyne

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :chemical reactions, calcium carbide, acetylene

    2.

    CH3C≡CCH2CH3→ii) H2Oi) O3C{H_3}C \equiv CC{H_2}C{H_3}\xrightarrow[{ii)\,{H_2}O}]{{i)\,{O_3}}} products are

    A

    CH3COOH+CO2C{H_3}COOH + C{O_2}

    B

    CH3COOH+CH3CH2COOHC{H_3}COOH + C{H_3}C{H_2}COOH

    C

    CH3CHO+CH3CH2CHOC{H_3}CHO + C{H_3}C{H_2}CHO

    D

    CH3COOH+CH3COCH3C{H_3}COOH + C{H_3}COC{H_3}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Ozonolysis, Alkyne Reactions, Oxidation

    3.

    Kolbe’s electrolysis of sodium maleate at anode gives

    A

    Only acetylene

    B

    Only CO2C{O_2}

    C

    Acetylene + CO2C{O_2}

    D

    CO2+H2C{O_2} + {H_2}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Kolbe's electrolysis, decarboxylation, reaction mechanism, organic chemistry

    4.

    Butyne on oxidation with hot. alk KMnO4KMn{O_4} gives

    A

    CH3CH2CH2COOHC{H_3}C{H_2}C{H_2}COOH

    B

    CH3CH2COOHC{H_3}C{H_2}COOH

    C

    CH3CH2COOH+CO2+H2OC{H_3}C{H_2}COOH + C{O_2} + {H_2}O

    D

    None

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Oxidation, Alkynes, Potassium permanganate, Cleavage reaction, Carboxylic acids

    5.

    Which of the following will react with sodium metal?

    A

    Ethene

    B

    Propyne

    C

    But-2-yne

    D

    Ethane

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Reaction with sodium metal, Terminal alkynes, Acidity of alkynes, Organic chemistry

    6.

    Acetylenic hydrocarbons are acidic because:

    A

    Sigma electron density of C—H bond in acetylene is nearer a carbon which has 50% s-character

    B

    Acetylene has only one hydrogen atom at each carbon atom

    C

    Acetylene contains least number of hydrogen atoms among the possible

    D

    Acetylene belongs to the class of alkynes with formula CnH2n−2{{\rm{C}}_n}{{\rm{H}}_{2n - 2}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :acidity of alkynes, hybridization, s-character, sigma bond

    7.

    What is the product formed when propyne reacts with sodium in liquid ammonia?

    A

    prop-1-yne

    B

    cis-prop-1-ene

    C

    trans-prop-1-ene

    D

    propane

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Alkynes, Reduction, Birch reduction, Alkenes

    8.

    Pure acetylene has sweet ethereal smell while impure smells like garlic due to presence of:

    A

    NH3{\rm{N}}{{\rm{H}}_3}

    B

    PH3{\rm{P}}{{\rm{H}}_3}

    C

    AsH3{\rm{As}}{{\rm{H}}_3}

    D

    H2S{{\rm{H}}_2}{\rm{S}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :chemical properties, impurities, gas identification

    9.

    Predict the product in the following reaction HC≡CH+RmgXoA→CH3MgXBHC \equiv CH + RmgX o A\xrightarrow{{C{H_3}MgX}}B, Here B is

    A

    CH3C≡CMgXCH_3C \equiv CMgX

    B

    HC≡CHHC \equiv CH

    C

    CH3CH2MgXCH_3CH_2MgX

    D

    HC≡CMgXHC \equiv CMgX

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Grignard reaction, Alkynes, Acid-base reaction, Nucleophilic attack

    10.

    Anti-addition of hydrogen atoms to the triple bond takes place by

    A

    H2/pd−BaSO4{H_2}/pd - BaS{O_4} in quinoline

    B

    Li/NH3Li/N{H_3}

    C

    Ni2B/H2N{i_2}B/{H_2}

    D

    Rho2Rh{o_2}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Hydrocarbons
    🎯Topic:Alkynes
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Reduction of alkynes, Anti-addition, Birch reduction

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